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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73eca81f4c197568a8e80d420ea1abc6d214a051a98cf29a68c066ec4b377a0' 
  AND token = 'nJGDCZsuoSM41xdZvNOEn75Ln0LQccb++fea2ndC+i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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