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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74298f3060806fd35ed9af074cdaa5e0cefe035c27c0c68f7aad12bd77c3e6d0' 
  AND token = 'tq6ZhVa2PuD6VG2V5qBjnMxyPP1lbnk30JkyIuBwUOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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