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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd328cd002b4bf479cfc1159eb4fa2f9485b4ad7525ea7a0950524e7db131e622' 
  AND token = 'Cz51O88it61DKdmJOPtTqMSIoO1b9hz4zfd9/SmGCIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}