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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eeeafc07b95588d8ef2321c90edc59a91ae83d751ea1c0f88ab4bf607bbe6d' 
  AND token = 'jhKbXfMg4pTbACpbtx6cnmk+H0GRynDPMxVYQzR+CWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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