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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2eb362294a9413a42ad7da2b56953450de4b637774e6a05d90237f554c8311f' 
  AND token = '7/f9VNgwrlYBKAiAy9kYJtCktI6DVqgXrbM0rXg1zyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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