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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fae7ae58bc3a8c56b72df7b039f0ddb836cdd9b211005ce999ecda00d50024' 
  AND token = '2pMqcXmoIiaaLZWw3EL1P5tuSStxf7Hq575rHtBkg2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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