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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e309e121308370f82f6763d676018f4d06a8b77b6a243d639c15aa2af07f8847' 
  AND token = 'eKp/yFn0D01morD8CkE2YQGNSj0+l6PQL2Dh1xeTopg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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