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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf59ee59c744f3b5a50db9f804483bfc712198ec137a7753bc54b7297bea6c7b' 
  AND token = 'I0ssj9uxvTtRdhgSUHmfzmzh2OTzugh7bNmhmLj9r9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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