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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2d6eaefc8e6c0a0fbffbba7dfb4cb817248fdca0227f59df1a6ded8a84921e' 
  AND token = 'jYZSsDMu0mkBsFu85qGw/HsCHb78Whvc6mq9x0i0eYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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