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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b895f0df698268e9279f68b438026c800db809849d700924db9d476753ae7f' 
  AND token = 'j1kuEOGjorgNKdWsaPxF7vwD4K9biakqMTOCVp+lvbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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