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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33559ef108529f35130db21d4611e6689b485d07d68cef9b8e7ac64730d328f2' 
  AND token = 'ZdrX+tTeSpdPTftxOh0uQUt90Uhow+00Jql9qpzRKFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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