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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f998d257a03a787d8ecb0f2a8c790a69846dbd1a91858919434f8373728e3bff' 
  AND token = '1I2GDsqcdlFrwcYxPhiO4Pclmgnr1cKCWnikvOdRduw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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