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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d811258295094068748d4e0c4426fde64d44e27e28743d9cce6ae13fac63aa' 
  AND token = '2Z/C4TKLOkj7PJ7Xh4n1qUs3+BzLb5z9x24UVKd8zyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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