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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a247ee3fc98a14ac87ef28757fea7f400f5a7bd2b9888fb4595a02f03c061b12' 
  AND token = 'q+g04w6DzbtQMrgzSiE5MsWfNbuyIfh3RQXdkAR6GFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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