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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31034b5f73a44d8abc80606388be5bf00d93920f09d2fa352c87159e942ac42' 
  AND token = '8Qj2mnIbGv4VgsjTmM+TM9QBE5Ka3OaaTxogABrH9V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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