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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be394a3fe513df5724a2d98c6b6ca2a804deaf8e3c12cd0762cc5a05b7c40e59' 
  AND token = 'yqBm8dFJn72SLJplixKlDE+l0IoGhcrllrW5H5JqWEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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