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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0135179df736d7a863bb11c8065fe69d484fdeeae2eaf8163db1ec244e081ee' 
  AND token = 'VHT14X2pZIYzzV8e3ZIrb+qLOXgA6QyJnrngQeR7Os8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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