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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9923f02fdbbc17e11037f05cb9b0418c3705785dbc5079392c5227bc153ccdb7' 
  AND token = '1PJF4DKn+/OStHFKAyuVVZkpGGSDQDdRdTJPn1Q0Hlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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