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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e53eeaa30796afd5f211e1125f793bc6555aee1c9912ffe9c85066fef4d2dc' 
  AND token = 'Rk+M2haPsLytJL5Jn36eZC4olzBdkdDudy3jetlxrwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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