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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87f06998d404f5a1f5614afcfc2b9ebdf3bf8bbb55b1874d67435121cbd1614' 
  AND token = 'DMKsD7oQ5uacGfbd3++sVsT2VnRSyaeqKQvRI7b7e3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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