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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969545b1fbb3187bc946a056e428ce7bae1b6db4f39e5a2a07ad14ccaa04483d' 
  AND token = 'M4JJPBBJE/8pnw6xBKsbI7YFAU1dV01/RlsSqHd3+aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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