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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce3bba4ba54d363e83b04c1586f395284815db40e170b071c9ea55477815d1b' 
  AND token = 'P5H7eMNbr6gCjDqMa57ASHUWfXjP0mmZ2QuSJrsGO3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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