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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e6f026418b6d56979165b52ed12e747b003c2942014bb9676650da421c809a' 
  AND token = 'S7dWM62LCqVTmMaLXPRnBt/H6h6zj31jn+CKxOOqhQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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