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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aba047a362546f17828f73d370a1db85154212c77ee17859166f894c43b3e5d' 
  AND token = 'UonNcx/JNPzxCKXAEF83LIL+XtUm1t0ZdMA45Vz/MGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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