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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe048637aa4fae3860735218299b6947105f0f4200cd38b41e9f6f4a9847623' 
  AND token = 'dhOcexyQz+Lrb18zPqWNjGiSV8rlO0Q2295jHEto4w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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