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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f27fa2bdafae882e187126ef891a6e600e43371db9af0e7469801d01fb57846' 
  AND token = 'IaoEfvlzWOH0gM9hFy4unnK6ZWlY2cZ79CWsrGBfpkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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