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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cfff9b8421c0dc140d360fb268d4ff8d88ce90edfc05ca59c584c8f76f4d9a' 
  AND token = 'zYM/xbazKXr5WI2hpmAy7MlHtoQliUbESDdU/+m/Yxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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