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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5e9a3b90c10e0138d7d098ea84c5969e3dcb10991b5e5285dd5f1c3117ffe2' 
  AND token = 'RURM/vJLN0ab4u1QkE7w2ISxAhijhUFuQLrQjU4Wm7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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