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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23150d3261da253d4dfa4f7d562b5a9033e85919d80158b967757e3de2873a24' 
  AND token = 'lHZDxMIcPZ+D3ynnf3QX5cZTYU1ax5lutOyLbewvuK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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