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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1928deb35d585ac1afebd627f500d5334edcee2d7815116d15b8e97f58c8f4' 
  AND token = 'fhv+RJTDFctab96cP1fN4wYOXlZFFXzt89tM8l6cVLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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