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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ae18285868a5dd2673e57b6d4a8150042d9cc849a94fb6c87c7e79dea01baf' 
  AND token = '/Jvrexha0WtxdzFhNetazYiIYm6kuDzu+0WthNxGAFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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