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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e241004b4c37882831a5e93c1a553d381ed54805b6585fac98abbcd0334886a' 
  AND token = 'ZaEQ4Nh2gLmOwJ0tuc9jVd+vMu4Z/SrsFUTX2Cpp0QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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