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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23972f759cd57293ff8785ad50295f75c8809e3b032985f88230b4333cda0d0' 
  AND token = 'qdAL+487ULJKBGiswtzyhEnIYm+m4t3zG0pMvzc7lEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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