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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28a976a06ec99dbc87638fecf9c5003853aee2400c8b695110b3cdbd6bead1c' 
  AND token = 'aa9xhNCLtGi0l/+Ct7EiRVV0cbT7m2BKsLML3re5lZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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