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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd9f1f0e1455cdadc2808afff32a3526e05870d66084d883a6b0501c5895c8a' 
  AND token = 'ZMsjv23f1WUyw4N6QrXanvC0hqJuy8GxtxvqTNr29u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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