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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a50c6ff0d7376c63d52111dfb99932f63fee332830914e17458a3f389f8acb' 
  AND token = '5b+Db16rCwYKshrCwmDCjP8atw+x+y/8lQtiKPDBy1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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