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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da9b59d99c061f059a0819f0f485e7abf57b2d912328be533d0b8f823e95ff7' 
  AND token = 'o1O8QX+ve4ZsVOZS0Hwmf4/pRgK58wljXk2keCKmUFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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