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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76262f0a6c7657f47ce44a176da61c888b8a7d65a3a01122b1b8e5905f3f96e7' 
  AND token = 'qkNxo4jevWItIoEZIZW3tDuYY4Ue468vvQsK+LNwj/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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