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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6106037e4a910bdfe9c2515722a01d23b3aeae09aefdb815b7cd54e6591756ee' 
  AND token = 'S7w2OOm/qYNhHkDBPXXeFv8+MNmZMNouo7VHlObSwNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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