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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1da067ff01ed1c6c2b9d70331cabe2aa5c8754106579463c070cb87377dae6' 
  AND token = 'xV3vZALKsPvZcivyF6/aqS11DcJ/0hF+VVtoostL5BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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