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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e914fff12d1b9a4da204df3cab365817cf2fd2886e8ab108de52d4c8a6596c' 
  AND token = 'jGBszrGcVuaFsLStIWXTvy50vasQcDX87EFJ5vzgf1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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