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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69db58f77cce7deb3f92e7c9fd396da03eed3bfd2a36c8ef779c33ea3480274c' 
  AND token = 'OB/8NNNSVgIVl5JXhRnD8EDpawehiqj/GcnKcdHi/C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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