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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404d1e951090c0426386ce44b86d97a9e9062762e52e9dec458b717467223083' 
  AND token = 'hNG0xRNx3thWQxQ3w6AVQ7Oy5ZJ6Qbjy0Ceh6x9e+GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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