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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606ba4f415730ab1e3a96dca529d7964454977d0e640f3107fa0242b1b0a51ba' 
  AND token = 'K3iUZrK5OzV7MVXH6L9FBNkz1rqnHDtx/Kq6P/iKbTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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