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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4577095c2b1394770082f86eb7d9a8b3ea58918f2b1dcf3e9fcc0a392d8d8729' 
  AND token = 'hpB3xsNEfmQ3wSINXKcvDhosFY2iUriprlNTAEttZ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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