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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bc990a8eaab3867477085e490fc931e39f5f3c60b876a4e4b1c5fd6cec5337' 
  AND token = 'TYMWpweZPw4oNkrv3bym25AwTnHtT7yRLswdjI4mkjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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