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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b362929b1db753994eb422e42e5350efc0eabfec93f86b0a89bf9e3c8efffb11' 
  AND token = '8lQfpFBCg6xsSzBrmFVMx374RGgaBIcZ1HG/yAiaVtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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