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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b446515916962109d89da858875214a3a2848791a8802006a6035ad21bc052' 
  AND token = 'qxrfe/D2xIg+kEFp2YZ929b0Z4uB/ml6eYZrjNT3DHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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