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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91e1802432725c008b05d6e6fc6c8c57335f7ad17711f88a396a4cc4bd6f119' 
  AND token = 'fMyNyR0WWJjlE8T6T7npugfZqtA7OFAJrJb4RliawI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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