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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab927462d7942b8330c0c95fc76a03321a63f545d034731e2a29c5923976fe4' 
  AND token = 'cTEOZX4r+hBJBqsm/9pi31Ilm8138BSOrje3hfbZsS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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