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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3c10a9a988bb3a4ba592069718953b5efb3a4b325d9292c00e6d7482bb430d' 
  AND token = '29w84dyDOuVOlzEOupzfDYnW8dWP3CEjgtdXAz+rfOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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