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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d0c1bee177807077a1564794741405d9bf6713e0496339ad48ca4dd920051a' 
  AND token = 'aVYBGThvxFm7zxOVskfJzc+6mafij7AZLUeEUYPm7X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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