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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecab42ee1d0ee9602de4757ab1e17d8a67076e00e5eae51050386d14576c3d19' 
  AND token = 'm47TxqxKRvO0lcflecdBHkmMkcyoOFONNjkykHJ3VNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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