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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c976e7c03b1df701cc6e04d7844d5de2c8a4b3ff924d375e854fbfcf8401b2c9' 
  AND token = 'rOkVcYtUkI+vy9DsLAVUIugqMV5EtlUDc72LACDKLFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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