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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aae0ac9ff5719c69e3816f0aef7aadd1b0d7de8f30944bbbaf237a707b37842' 
  AND token = 'fk9b3X6zbKc0I2iZX+IVigIUltGT+MX1iuS7go129RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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