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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd03f1ef96be6dd3a26b6d8cd588ff8ebaa15a59633d520cefeb0f91e889a855' 
  AND token = 'TjBl7r340KBugy5pRhcxTyH/45Cv7S8Ef2Wmp3g4//4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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