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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b013f79d5b76d1d1dfa17ac9faa3ed422711657a9eaf3cc15d054d3c4a26f91b' 
  AND token = 'FDDlZT8+rU+ifQorupoeK5OviR7tEgC/jNJLR5j9Rss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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