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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8349638283e135686c76db14468175718437f62f72065e7109e3d5c81f2056' 
  AND token = '6RaHq4VCJ90P/ioGR1Fk8XJMOL9tVbmzp5X9EOVLH6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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