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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76967f9f186fa294b65668c56ec3b68f86be86e71613915f8c629d3bfe4fd5a6' 
  AND token = 'Ia9GKomo0goIj7i76GEvU12/SLTiVRVG/l96JU9KLNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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