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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ced8bebd4941b9fd660767b3c531201c62f8d1413d3e0ac696f223522ba9b0' 
  AND token = '0OcsPf5ajQ+MbN8IObeDEI0fu84aQmtTqVRcqk//t5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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