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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb68cd6f1609b7bf0efc5dea4cfb86722c1004e6f2953db4133f5f7bcc0889f6' 
  AND token = 'nUebADw4WW+5l0toVho1pXGwQVbhnYkn2qFHp41hLkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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